JPS6136413Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a differential lock operating device that is capable of reliably defrocking each of the front and rear wheel systems of a vehicle equipped with a differential device and a differential lock device, respectively.

2. Description of the Related Art Some vehicles are equipped with a differential device and a differential lock device for the front and rear wheels, respectively, and the differential pedals for the front and rear wheels are arranged side by side so that they can be depressed simultaneously. This type of device is extremely convenient in that it allows the front and rear wheel system defrock devices to be operated at the same time, but it has the drawback that mutual adjustment of the defrock devices becomes complicated and smooth operation is impaired. In other words, when the differential pedals are arranged side by side so that they can be depressed simultaneously, it is necessary to make the strokes of the differential pedals perfectly match, but there are various factors such as play in the interlocking mechanism.
It is difficult to achieve perfect matching, and therefore, there have been cases where one side is in the defrocked state while the other remains in the unlocked state.

The present invention is aimed at solving these conventional problems, and its features are that a step 16 is provided on the side of the tractor body 1 between the front and rear wheels 5 and 11; The lower side of step 16 contacts the brake pedal 28 and the brake pedal 2
A rear wheel differential lock pedal 2 is provided on one side of the upper part of the tractor body 1 behind the step 16.
5 and a front wheel differential lock pedal 26 are arranged side by side so that they can be operated simultaneously, an intermediate lever 33 is provided with an upper end of an intermediate lever 33 below the step 16, the lower end of which hangs down to near the bottom of the tractor body 1, on the bracket 34. The rear end of the front wheel differential lock pedal 2
The front end side of the first rod 38 connected to the intermediate lever 33 is slidably inserted into the intermediate lever 33.
3 and the differential lever 10 on the front axle case 6 side that supports the front wheels 5 are connected by a second rod 44 extending in the longitudinal direction and arranged substantially horizontally along the tractor body 1. When the front wheel differential lock pedal 26 is depressed, a first rod 38 is inserted between the front end of the intermediate lever 33 and the intermediate lever 33.
3 is provided with a compression spring 43 for swinging it in the defrock direction.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. In FIGS. 1 to 4, reference numeral 1 denotes a tractor body, which is composed of an engine 2, a clutch housing 3, a transmission case 4, and the like. 5 is the front wheel,
A front axle case 6 has a built-in front wheel differential device, and is swingably supported by a central shaft 7 on a front axle bearing stand 8 at the front end of the tractor body 1. The front wheel differential device is equipped with a front wheel differential device that is linked to a differential shaft 9 and a differential lever 10.
When the differential lever 10 is rotated about the differential lock shaft 10 in the direction indicated by the arrow a, the front wheel differential device is differentially locked. Rear wheels 11 are mounted on both rear sides of the transmission case 4 via a brake device 12, a rear axle case 13, etc., and are driven via a rear wheel differential device. The rear wheel differential device has a rear wheel differential lock device and is built into the transmission case 4. 14 is a hydraulic system for raising and lowering the working machine, and 15 is a driver's seat. Steps 16 are arranged on both sides of the center of the tractor body 1, and are fastened to the front pedestal 17 and the rear pedestal 18 with bolts and nuts via vibration isolators 19 and 20. The front cradle 17 is attached to the clutch housing 3 with bolts 22 via a mounting plate 21 fixed on the inner end side, and the front cradle 17 has a U-shape that also serves as reinforcement. A work equipment mounting stand 23 is integrally provided,
A work machine such as a front loader can be attached to the front surface of the work machine mounting base 23. Reference numeral 24 denotes a differential pedal shaft of a rear wheel differential lock device, which is rotatably inserted and supported in the transmission case 4, and a rear wheel differential pedal 25 is fixedly installed on the protruding end of this differential pedal shaft 24. At the same time, a front wheel differential lock pedal 26 is rotatably supported. The rear wheel differential lock pedal 25 can be depressed independently, and when depressed around the differential pedal shaft 24 in the direction indicated by arrow b, the rear wheel differential device is deflocked. The front wheel differential lock pedal 26 has an engaging portion 27 that engages with the rear wheel differential lock pedal 25 from above, and when the engaging portion 27 is depressed, the rear wheel differential pedal 25 also operates in conjunction with the engaging portion 27. Reference numeral 28 denotes a pair of brake pedals, one on the left and one on the left.
6 is a penetrating shape, and they are arranged side by side on the left and right.
The lower end of each brake pedal 28, 28 is connected to a pedal shaft 29 which is horizontally mounted on the lower end of the transmission case 4.
The left and right brake devices 12 are interlocked and connected via a brake rod 30, a cam lever 31, and the like. 32 is a return spring, which urges the brake pedal 28 in the brake release direction.
Each is stretched.

Reference numeral 33 denotes an intermediate lever, and as shown in FIGS. 1 to 3, the upper end of the intermediate lever 33 is attached to a support shaft 35 that is provided in a lateral protruding manner on a mounting bracket 34 fixed to the lower surface of the step 16. It is pivotally supported and has a substantially hanging shape. Further, a rod insertion hole 36 is formed in the vertically intermediate portion of the intermediate lever 33, and a first rod 38 connected to the front wheel differential pedal 26 via a link 37 is slidable relative to the rod insertion hole 36. A compression spring 43 is interposed at the insertion end of the rod 38 so as to be adjustable via bowl-shaped spring receivers 39, 40, an adjustment nut 41, a lock nut 42, etc. A lower end portion of the intermediate lever 33 located near the lower portion of the tractor body 1 is interlocked and connected to the defroster lever 10 via a second rod 44 extending in the longitudinal direction and disposed substantially horizontally along the tractor body 1. . Further, the mounting bracket 34 is provided at its lower portion with a suitably inclined stopper portion 45 that abuts the left and right brake pedals 28, 28, and is configured to prevent the brake pedals 28, 28 from returning at the brake release position. 46 is the stopper part 4
5 A shock absorbing member provided on the lower surface, made of an elastic material such as rubber.

Next, the effect will be explained. When only the rear wheel differential device is to be differentially locked, the rear wheel differential device is activated by depressing the rear wheel differential pedal 25 around the differential pedal shaft 24 in the direction of arrow b.

When both the front and rear wheel differential devices are to be deflocked, the front wheel differential pedal 26 is depressed in the direction of arrow b. Then, the engaging portion 27 engages on the rear wheel differential lock pedal 25, and the front wheel differential lock pedal 26 and the rear wheel differential lock pedal 25 rotate together in the direction of arrow b, so that the rear wheel At the same time that the differential device is differentially locked, the front wheel differential device is also differentially locked. That is, when the front wheel differential lock pedal 26 rotates around the differential pedal shaft 24 in the direction indicated by arrow b, the link 37 rotates together with this, pulling the first rod 38 rearward in the direction indicated by arrow c. Therefore, the operating force is applied to the intermediate lever 33 via the compression spring 43.
The intermediate lever 33 is transmitted to the support shaft 35.
Rotate in the direction of arrow d. When the intermediate lever 33 rotates in the direction indicated by the arrow d, the differential lever 10 rotates in the direction indicated by the arrow a around the diffraction shaft 9 via the second rod 44, and the front wheel differential device is differentially locked. be. In this case, for example, even though the rear wheel differential lock device has operated, if the differential pin of the front wheel differential lock device remains in contact with the differential side gear and does not operate, the compression spring 43 will only be compressed, and the intermediate lever 3
3 does not rotate in the direction of arrow d. When the differential lock pin matches the pin hole of the differential side gear, the elastic force of the compression spring 43 causes the intermediate lever 33 to
rotates around the support shaft 35 in the direction indicated by arrow d, and the front wheel differential device is differentially locked as described above.
Therefore, regardless of the state of each of the front and rear wheel differential lock devices, they can always operate smoothly and reliably. In addition, when adjusting the defrock device, there is no need to match each stroke, and the front and rear can be adjusted individually, making the adjustment work very easy. Furthermore, since the bracket 34 is configured to serve both as a stopper for the brake pedal 28 and as a member that supports the intermediate lever 33, no separate parts are required.
The number of parts can be reduced and the cost can be reduced.

According to the present invention, the upper end of the intermediate lever 33 disposed below the step 16 is pivotally supported by the support shaft 35,
This and the front wheel differential lock pedal 26 are interlocked via the first rod 38 and the compression spring 43, and the lower end of the intermediate lever 33 and the differential lever 10 of the front axle case 6 are moved approximately horizontally along the tractor body 1. Since the second rods 44 in the longitudinal direction are arranged in a shape, the differential lever 10 can be easily connected to the differential lever 10 even if the differential pedal 26 is located on the upper side of the tractor body 1. , it does not impair operability even on large tractors. Further, since the intermediate lever 33 is used as a relay, the difference in the amount of movement between the defroc pedal 26 and the defroc lever 10 can be adjusted by adjusting the connection position of each rod 38, 44 with respect to the intermediate lever 33, which facilitates the design. Moreover, since the intermediate lever 33 is located below the step 16, even though the two rods 38 and 44 are connected to it, they do not pose any obstacle to the driving operation, and the intermediate lever 33 can be used in the vicinity of the step 16. Can be simplified. Furthermore, since the intermediate lever 33 is located below the step 16, the length of the second rod 44, which is disposed approximately horizontally in the front and back direction, is shorter than in a structure in which the intermediate lever is disposed on the rear side of the step 16. It can be shortened, and therefore there is no risk of malfunction due to bending of the second rod 44, etc. Furthermore, the front wheel differential lock pedal 26 is arranged in parallel with the rear wheel differential lock pedal 25,
Although both can be operated simultaneously, the front end of the first rod 38 is slidably inserted into the intermediate lever 33, and a compression spring 43 is inserted between the front end of the first rod 38 and the intermediate lever 33. Since the intermediate lever 33 is swung in the diffraction direction from the first rod 38 via the compression spring 43 when the front wheel differential lock pedal 26 is depressed, the front and rear wheel differential lock devices can be easily operated with a simple configuration. It can be operated smoothly without any problems. That is, since the compression spring 43 is compressed when the front wheel differential lock device is not operating, if the engaging portions on the front wheel differential device side are aligned after the rear wheel differential lock device is activated, the intermediate lever 33 is defroced by the compression spring 43. Therefore, it is possible to operate the front and rear defrock devices smoothly with a simple structure in which the compression spring 43 is interposed.

Further, the bracket 34 is configured to serve both as a stopper for the brake pedal 28 and as a member for supporting the intermediate lever 33, which has the advantage of reducing the number of parts and making it inexpensive.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a side view, FIG. 2 is a view taken along the line in FIG. 1, FIG. 3 is a view taken in the direction shown in FIG. FIG. 2 is a partial perspective view of FIG. 1; 1...Tractor body, 6...Front axle case, 1
0...Defrot lever, 16...Step, 2
5... Rear wheel differential lock pedal, 26... Front wheel differential lock pedal, 28... Brake pedal, 33...
... intermediate lever, 34 ... bracket, 38 ... first rod, 43 ... compression spring, 44 ... second rod, 45 ... stopper section.

Claims (1)

[Scope of utility model registration request] A bracket 3 is provided with a step 16 on the side of the tractor body 1 between the front and rear wheels 5 and 11, and has a stopper portion 45 below the step 16 that contacts the brake pedal 28 and restricts the return of the brake pedal 28.
4, and the tractor body 1 is installed behind step 16.
In a tractor in which a rear wheel differential lock pedal 25 and a front wheel differential lock pedal 26 are arranged side by side on one side of the upper part of the tractor so that they can be operated simultaneously, there is an intermediate lever below the step 16, the lower end of which hangs down approximately to the vicinity of the lower part of the tractor body 1. The upper end side of the first rod 38 is pivotally supported on a support shaft 35 provided on the bracket 34 so as to be able to swing back and forth, and the front end side of the first rod 38 is connected to the intermediate lever 33 and the rear end is connected to the front wheel differential lock pedal 26.
The lower end of the intermediate lever 33 and the differential lever 10 on the side of the front axle case 6 that supports the front wheels 5 are connected to a front-rear lever located substantially horizontally along the tractor body 1. They are connected by two rods 44, and the front end of the first rod 38 and the intermediate lever 33
A compression spring 43 is interposed between the front wheel and the front wheel to swing the intermediate lever 33 in the defrocking direction via the first rod 38 when the front wheel differential pedal 26 is depressed.